Maths I can battle with qustion (1), but look at 2&3 i don.t even know were to start from pls help
August 2, 2015

MathsQuestion(1):Show that the curve y=x^2-3x-5 passes through the point (5,5),(4,-1),(2,-7),(0,-5) and (-t,5) calculate the gradient at each pont. question(2):given a 5by5 matrices with determinant equal zero and the same determinant of its interior element equals zero question(3...
August 2, 2015

EngineeringFor what values of (¢ belongs to R) the following system of equations has (1)no solution (2)a unique solution (3)infinitely many solutions? (5-¢)x+4y+2z=4 4x+(5-¢)y+2z=4 2x+2y+(2-¢)z=2 2) Consider three planes in R3. List all possibilities of their ...
August 2, 2015

EngineeringFor what values of (¢ belongs to R) the following system of equations has (1)no solution (2)a unique solution (3)infinitely many solutions? (5-¢)x+4y+2z=4 4x+(5-¢)y+2z=4 2x+2y+(2-¢)z=2
August 2, 2015

Mathsqustion(1):find the product of xy if x,3/2,6/7,y are in a g.p qustion(2):calculate the angle between the vector u=2i+2j and v=2i+2ji qustion(3):if the center of a circle,the tangent from X touches A&B and AC is a diameter if AOB=47 calculateBOC
July 30, 2015

mathsif the radius of a sphere decreases by 0.1%,find the percentage decreases in (i)surface area (ii)volume
July 28, 2015

IntegersSome typical daily low temperature for Alaska cities in February are Anchorage, 12F, Fairbanks, 14F, Kotzebue, -12F, Gulkana, -7F, and Nome -4. Find the average of these temperatures.
May 23, 2015

IntegersA hockey players play minus rating compares the number of goals scored by his or her team (plus) to the number scored by the opponents (minus) while he or she is playing. In 1986 eight players on the San Jose Sharks had an average plus-minus rating of -17. What was the total ...
May 23, 2015

IntegersSuppose Frontier City Amusement Park bought a ferris wheel for $92,000. 42,512 people paid $2.00 each to ride the ferris wheel the first year. Ignoring the cost of operating how much money did the park lose on the ferris wheel it first year.
May 23, 2015

IntegersAt 11:00 pm the temperature was -9 degrees. By 7:00 am the temperature had risen 18 degrees. What was the temperature at 7:00 am.
May 22, 2015

integersA submarine was at a depth of 225 meters below sea level. It rose 80 meters, then it dove 35 meters. How far below sea level was the submarine after ascending and descending.
May 22, 2015

IntegersA scientist measured the temperature at the surface of a 7 inch deep snow. The temperature was -27 degrees. At ground level, the temperature was 24 degrees. How much warmer was the temperature at ground level.
May 22, 2015

Math- integersThe greenhouse effect occurs on many planets. If the actual temperature on Venus is -40 degrees, the temperature with the greenhouse effect is 800 degrees. What is the difference between the actual temperature and the temperature with the greenhouse effect.
May 22, 2015

english What does the speaker in Remembrance plan to do? a. Forget her beloved. b. Live in mourning forever. c. Find a new love. d. Go on with her life.
May 19, 2015

mathTodd run 8 laps around a 400-meter track on Monday, 4 laps on Tuesday, 8 laps on Wednesday, 4 laps on Thursday, and 8 laps on Friday. How many kilometers did he run?
May 19, 2015

MathA swimming pool is 75 feet long, 45 feet wide, and 8 feet deep. It is filled to a depth of 5 feet. What is the volume of the pool?
May 19, 2015

MathWhat is the volume of a coffee can that is 6.5 inches high and has a diameter of 5 inches. round your answer to the nearest tenth.
May 19, 2015

mathHOMEOWNERS IN UNITED STATES USE MORE THAN 15 MILLION POUNDS OF PESTICIDES ON THEIR LAWNS EVERY YEAR. CONVERT THIS RATE TO OUNCES PER DAY ROUNDED TO THE NEAREST WHOLE NUMBER.
May 16, 2015

mathwhile training for a marathon Anderson is supposed to run a total of 10 miles total during the week. he ran the following number of miles from Monday to Saturday: 4 1/2, 1 2/3, 4/6, 3 1/12, 1/6 how far did Anderson run during the week?
March 25, 2015

physics a brass rod is 2 m long at a certain temperature. what is its length for a temperature rise of 100 K, if the expansivity of brass is 18 *10^-6K-1?
March 7, 2015

Math1. Scale is 1 in.= 3 ft. If the room is 8 inches long and 2 inches wide on a blueprint, how much will it costs to clean the carpet if the costs is $15 per square foot?
February 25, 2015

chemistrydid i answer the question: Explain how one of the major concepts learned in CHM 111 applies to everyday life. One major concept that was learned in CHM 111 that applies to everyday life is stoichiometry. Stoichiometry is founded on the law of conservation of mass where the ...
January 11, 2015

ap chemistrydid i answer the question: Explain how one of the major concepts learned in CHM 111 applies to everyday life. One major concept that was learned in CHM 111 that applies to everyday life is stoichiometry. Stoichiometry is founded on the law of conservation of mass where the ...
January 10, 2015

marhsA wheel is free to rotate about its fixed axle. A spring with constant k = 290 N/m is attached to one of its spokes a distance r = 23 cm from the axle, as shown in the figure. (a) Assuming that the wheel is a hoop of mass m = 490 g and radius R = 0.97 m, what is the angular ...
November 15, 2014

mathf(x)= 1/3x^5 + x^-2 + 3, then f'''(x) is.. I got f'''(x)= 20x^2-24x^-5 Can you tell me if I got this right
November 11, 2014

PhysicsThree particles A, B, C start from the origin from the same time, A with velocity a along x-axis, B with velocity b along y-axis, C with velocity c in xy plane along a line x=y. What should be the magnitude of c so that they always remain collinear is (a). (a+b)/2 (b). √...
November 6, 2014

physicsA 80-kg man stands on a bathroom scale inside an elevator. (a) The elevator accelerates upward from rest at a rate of 1.40 m/s2 for 1.50 s. What does the scale read during this 1.50 s interval? N (b) The elevator continues upward at constant velocity for 8.50 s. What does the ...
October 14, 2014

physicsThe figure below shows Superhero hanging motionless from a rope, with Trusty Sidekick hanging below him. Superhero's mass is 89.0 kg, while Trusty Sidekick's is 58.0kg, and the mass of the rope is negligible. (a) Find the tension in the rope at a point between ...
October 14, 2014

PhysicsI need help setting up this problem. A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 19 m, it has dropped 58 cm from its original height when it left the racquet. What was the ...
September 30, 2014

PhysicsI need help setting up this problem. While standing on the roof of a building, a child tosses a tennis ball with an initial speed of 15 m/s at an angle of 20° below the horizontal. The ball lands on the ground 2.8 s later. How tall is the building? Thank you.
September 30, 2014

Physics RepostI need help setting up this problem. A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 19 m, it has dropped 58 cm from its original height when it left the racquet. What was the ...
September 30, 2014

Physics RepostI need help setting up this problem. While standing on the roof of a building, a child tosses a tennis ball with an initial speed of 15 m/s at an angle of 20° below the horizontal. The ball lands on the ground 2.8 s later. How tall is the building? Thank you.
September 30, 2014

PhysicsI need help setting up this problem. While standing on the roof of a building, a child tosses a tennis ball with an initial speed of 15 m/s at an angle of 20° below the horizontal. The ball lands on the ground 2.8 s later. How tall is the building? Thank you.
September 30, 2014

PhysicsI need help setting up this problem. A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 19 m, it has dropped 58 cm from its original height when it left the racquet. What was the ...
September 30, 2014

physicsI need help attacking this problem A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just ...
September 21, 2014

PhysicsA steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor on its way ...
September 20, 2014

PhysicsA steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor on its way ...
September 18, 2014

mathscalculate the total surface area of a solid cone of slant height 10cm. use the value 3.14 for radius
May 2, 2014

physics-impulseA tennis ball of mass m = 0.068kg and speed v = 21m/s strikes a wall at a 45∘ angle and rebounds with the same speed at 45 What is the magnitude of the impulse given to the ball?
March 14, 2014

physicsA child in a boat throws a 5.15-kg package out horizontally with a speed of 10.0 m/s. The mass of the child is 24.2kg and the mass of the boat is 33.2kg . Calculate the velocity of the boat immediately after, assuming it was initially at rest.
March 14, 2014

MathJacob is baking chocolate chips cookies. the recipe uses 3/4 cups of sugar. Jacob wants to make one half of a batch. how many cups of sugar does he need? 1/4
January 30, 2014

MathJacob is baking chocolate chips cookies. the recipe uses 3/4 cups of sugar. Jacob wants to make one half of a batch. how many cups of sugar does he need? 2/3
January 30, 2014

health the key to using a pedometer to meet the physical activity guidlines for americans is to?
January 4, 2014

science@@@@how to make a model for scince fair for purification of smoke coming out of chimneys? And how this purified smoke can be used for useful purposes? Does smoke contain moisture?
October 20, 2013

mathA street light is mounted at the top of a 19-ft-tall pole. A man 5.5 feet tall walks away from the pole with a speed of 14 ft/s along a straight path. How fast is the tip of his shadow moving when he is 100 feet from the pole?
October 18, 2013

scince@@@i have to make a model for science fair. Any new development!. So please give me only idea that which new development can be possible with the help of eddy currents or induction of emf...........
September 28, 2013

PhysicsIn a physics study group, a friend says in a profound tone that light is the only thing we can see. After a few laughs, your friend goes on to say that light is produced by the connection between electricity and magnetism. Is your friend correct? My responds is that my friend ...
August 24, 2013

physics £££according to einstein's mass energy relation M= m'/root[1-(v^2/c^2)] Where M is mass of particle when it moves with velocity 'v' And m' is its initial mass. When particle moves with velocity of light i.e. When 'v=c' then M= m'/0 =infinity i.e. ...
August 11, 2013

mathsan amount of Rs 5000 is put into three/investments at the rate of interest of 6%, 7%, 8% per annum respectively; the total annual income is Rs 35800. If the combined income from first two investments is Rs 70 more than the income from the third. Find amount of each installment...
July 1, 2013

physicshow to show with the help of a model that resistivity of a conductor increases with increase in temperature?
June 27, 2013

physicsprove that average velocity of particle over an interval of time is either smaller than or equal to average speed of particle over same interval?
June 23, 2013

physicsplease give me some idea for making a working model based on optics. Like combination of light and lenses, spectrum etc......& how can i make a working model with the use of contact lenses....
June 18, 2013

physics1.descibe the construction and working of machine used to generate high voltage? 2.draw electric lines between the plates of a parallel plate capacitor with 1(air) and 2(dielectric) as a medium? 3.near the surface of earth the field is about 100V/m. why do we then not ...
June 10, 2013

physicshow does the total energy stored in a capacitor change, when the medium of air is replaced by a medium of dielectric constaant K? Explain.
June 10, 2013

chemistry1.what is the advantage of heating gellium semi-conductor with sites or gold instruct of indium and boron? 2.why co-ordination number of 12 is not found in ionic crystals? 3.what kind of symmetry is exhibited by a match box?
June 7, 2013

trigonometrysine is function 1/2cos^-1 is its angle. so i can convert cos^-1 into sin^-1 but can i cancel this with sin because there is (1/2).
June 4, 2013

trigonometry1.if 2^x+2^y=2^(x+y) then dy/dx is equal to what? 2.If x.root(1+y)+y.root(1+x)=0 then dy/dx is equal to what? 3.Sin[(1/2)cos^-1(4/5)] is equal to what? 4.check the continuity of function f(x)=2x+3 at x=1. 5.check the continuity of the function F(x)={e^x - 1 -x ; x not equal to...
June 4, 2013

ScienceA Family travels 200 km in two hours and 20 min .then they stop to eat lunch.After lunch they travel 300 km In Two 3 Hours and 40min.What is the average speed during the entire trip?
April 7, 2013

mathsa matrix X has a+b rows and a+2 columns while the matrix Y has b+1 rows and a+3 columns. both matrices XY and YX exist. find a and b. can you say XY and YX sre of same type? are they equal?
April 4, 2013

mathsa trust fund has rs30000 that must be invested in two diferent types of bonds.the first bond pays 5% and second 7% interest per year. using matrix multiplication determine how to divide rs 30000 among two types of bonds if the trust must obtain na annual total interest of (a)...
April 4, 2013

physicsa ball rolling on oa inclined plane dors so with constant acceleration. One ball, A, is released from rest on th etop of an inclined plane 18m long to reach the bottom 3s later. At the same time as A is released, another ball, B, is projected up the same plane with a certain ...
March 24, 2013

ChemistryA buffer consists of 0.16 M KHCO3 and 0.39 M K2CO3. Carbonic acid is a diprotic acid with Ka1 = 4.5 10-7 and Ka2 = 4.7 10-11. (a) Which Ka value is more important to this buffer? Ka1 Ka2 I don't understand this one at all. How do I determine which Ka value is more ...
March 4, 2013